"I've been working all year trying to do it healthfully and slowly, but you know what, he's loved me at all weights, so if I gain 30 pounds before then – I don't want to! – but he'll still marry me," says Lambert, 27, who on Sunday took several honors at the 46th Annual Academy of Country Music Awards – hosted by Shelton. Her awards were for favorite female vocalist, record of the year, video of the year and song of the year for her ballad "The House that Built Me."

With the wedding barely more than a month away, "it's about to be crash time!" she says jokingly. On a more serious note, she says, "I'm really excited about the wedding. It's kind of like when you're little and you know you're going to Six Flags in a month and you're like, I'm ready to go now."